File kdump-check-explicit-ip-options.patch of Package kdump.21349

From: Petr Tesarik <ptesarik@suse.com>
Date: Fri Mar 5 11:06:35 2021 +0100
Subject: Do not add network-related dracut options if ip= is set explicitly
References: bsc#1182309
Upstream: merged
Git-commit: bbe9b1281cd6c26ec937c6fee622ad7a84da959d

If the KDUMP_COMMANDLINE or KDUMP_COMMANDLINE_APPEND contain an
explicit ip= option, do not try to add anything automatically,
because it will clash with the admin's intention.

Signed-off-by: Petr Tesarik <ptesarik@suse.com>

---
 doc/man/kdump.5.txt.in |    8 ++++++--
 init/module-setup.sh   |   15 +++++++++++++++
 2 files changed, 21 insertions(+), 2 deletions(-)

--- a/doc/man/kdump.5.txt.in
+++ b/doc/man/kdump.5.txt.in
@@ -580,8 +580,12 @@ _netdevice_ is for example "eth0". The _
   * use DHCP6 if it has a permanent IPv6 address (IPv4 not set up),
   * use IPv6 auto-configuration if it has neither (IPv4 not set up).
 
-You can set KDUMP_NETCONFIG to "" if you want no network in initrd, i.e. you use
-disk dumping.
+*Note:* If an _ip=_ option is found in KDUMP_COMMANDLINE or
+KDUMP_COMMANDLINE_APPEND, kdump does not add any other _ip=_ or _ifname=_
+options. In other words, the value of KDUMP_NETCONFIG is effectively ignored.
+
+Setting KDUMP_NETCONFIG to "" disables network completely. In this case, kdump
+does not even add the _network_ dracut module to the initrd.
 
 Default: "auto"
 
--- a/init/module-setup.sh
+++ b/init/module-setup.sh
@@ -193,9 +193,24 @@ kdump_cmdline_zfcp() {
     } | sort -u
 }
 
+kdump_ip_set_explicitly() {
+    local _opt
+    for _opt in $KDUMP_COMMANDLINE $KDUMP_COMMANDLINE_APPEND
+    do
+        if [ "${_opt%%=*}" = "ip" -a \
+             "${_opt#*=}" != "$_opt" ]
+        then
+            return 0
+        fi
+    done
+    return 1
+}
+
 kdump_cmdline_ip() {
     [ "$kdump_neednet" = y ] || return 0
 
+    kdump_ip_set_explicitly && return 0
+
     echo -n "$kdump_netif"
 
     case "$kdump_net_mode" in